Ventilator.



B. W. WOLF.

VENTILATOR.

APPLICATION FILED MAY 5. 1916.

VENTILATOR.

Specification of Letters Patent.

Patented Apr. 23, 11911..

Application filed May 5, 1916. Serial No. 95,691.

The invention aims to provide a damper which is so supported, adjustably, that it will stand normally in an open or partially open position thereby permitting the entrance of air, the construction being such that when the air pressure from the outside is increased, the damper will close, thereby preventing a draft, the damper opening automatically when the pressure on the outside of the building falls.

Another object of the invention is to provide a ventilator including a damper which may be made unusually sensitive and readily responsive to the pressure changes.

It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type-to which the present invention appertains.

With the above and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made Within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawings Figures 1 and 2 are longitudinal sections wherein the cutting planes lie at right angles to each other;v I H Fig. 3 is a bottom plan of the ventilator forming the subject matter of this application; and

Fig. 4 is a fragmental side elevation showing a portion of the ventilator.

In the drawings, the numeral 1 indicates a portion of the "roof of a building carrying a stack 2 of any desired sort, constituting a part of theventilator forming the subject matter of this application. Although the stack 2 may be fashioned as the exigencies of the proposed use demand, the stack in the present instance is depicted as comprising a cylindrical bottom 3 assembled immediately withvthe roof 1, a tapered body 4 and a cylindrical top 5 carrying a screen 6. The bottom 3 of the stack is circumscribed by a bead 7 constituting a shoulder. In the lower edge of the bottom 3 of the stack 1 there is formed a bayonet slot & The numeral 9 denotes a latch supported on the bead or shoulder 7 and equipped in its upper edge with anotch 10 disposed transversely of the horizontal arm of the bayonet slot 8. The latch 9 is held in place by a removable securing element 11 which may be a bolt and nut structure passing through the bottom portion 3 of the stack.

The numeral 12 denotes a shaft, one end 1e of which is located in the horizontal portion of the bayonet slot 8 at the inner end thereof, the end 14 of the shaft being journaled in the notch 10 of the latch 9. The other end 15 of the shaft 12 is j ournaled in the opening in the bottom portion of the stack 2. The end 15 of the shaft 12 is provided witha cross arm 16 which may be held in place by a nut 17. The cross arm 16 is adapted to receive the usual depending cords, or other means (not shown) whereby the shaft 12 and the damper carried thereby, may be manipulated. The numeral 18 designates the damper above alluded to, and the same is attached to the shaft 12 by means of securing elements 19.

The damper 18 is of such size as to fill substantially the'bottom portion 3 of the stack so far as the cross sectional area of the bottom portion of the stack is concerned. The numeral 20 denotes a stop held on the bot tom portion 3 of the stack by a securing memthe stop 20. The numeral 25 indicates an 1 angle bracket located opposite to the angle bracket22, the angle bracket 25 being attached to the damper 18 by means of securing devices 26. Mounted in the depending arms of the angle brackets 25 and 22 is a screw 27 held in place by the nuts-28 engaging the inner and outer faces of the, arms of the angle brackets. weight 29. is threaded onto the screw 27 and may be adjusted longitudinally of the screwfor a purpose to be set forth hereinafter. Threadi ed onto the screw 27 and engaging the ends of the weight 29 are nuts 30 which constitute a means for holding the Weight in adjusted positions.

It is tovbe observed that the shaft 12 does will cause the damper to swing to a closed position, into contact with the stop 24. The entrance of air into the building will then be interrupted, and a draft will be avoided. So soon as the pressure outside of the building decreases, the damper will swing to an open position, owing to the location of the weight 29. Since the shaft 12 divides the damper ,into a large part 31 and a small part 32, the large part 31, when acted upon by an inward draft of air, under an increased pressure, will cause a closing of the damper as aforesaid.

By backing away one of the nuts 30 from the weight 29, and by rotating the weight,

the wei ht may be made to move along the screw 2 from one end of the screw to the other. Thus, the damper 18 may be poised to stand open to any desired extent. The weight 29 may be held in adjusted positions by rotating the nuts 30 on the screw 27 until the nuts bear against the ends of the weight as shown in Fig. 1.

The structure delineated in Fig. 4- of the drawings constitutes a convenient means whereby the damper shaft 12 maybe detachably assembled with the bottom portion 3 of the stack 2. The end 15 of the damper shaft 12 is thrust through an opening prepared for its reception at one side of the bottom 3 of the stack 2, and then the end 14 of the damper shaft 1s passed upwardly through the vertlcal branch of the bayonet slot 8, and then is pushed horizontally into the lateral branch of the bayonet slot until the shaft assumes the position shown in F g. 4. The latch 9 is then mounted in position on the shoulder 7, the end 14 of the shaft extending through the. slot 10. The securing device 11 then is mounted in place,

whereupon the end 14 of the shaft 12 is securely journaled for rotation in the cylindrical bottom 3 of the stack.

If desired, the tapered-body portion 4 of the stack may carry a stop 50 which cooperates with the larger part 31 of the damper 18, to limit the damper to a substantially vertical )osition when the damper is open.

Let it be supposed that the damper is held in a closed position, as shown in Fig. 1, by a strong draft of air through the stack. Let it be supposed, further, that a sudden increase of pressure, due to an explosion, occurs within. the building. Then the damper will be swung to an open position, and the pressure within the building will be relieved, this opening taking place because, owing to the position of the shaft, the damper is divided into relatively large and small parts.

Having thus described the invention,

. what is claimed is In a device of the class described, a stack; a swinging damper in the stack; a stackcarried pivot for the damper, the damper being assembled with the pivot to one side of the center of the damper, thereb dividing the damper into a light part am a rela tively heavy part, whereby the damper will tend to gravitate to a closed position; a bracket carried by the light part of the damper and located to one side of the pivot; an angle bracket comprising a first arm secured to the damper on the other side of the pivot, and a depending arm; astop carried by the stack, the first arm of the angle bracket being adapted. to coact with the stop when the damper swings to a closed position, thereby to prevent a distortion of the damper; a rod threaded from end to end, and having its ends extended throu h the first specified bracket, and through 51c depending arm of the angle bracket; nuts on the rod and engaging the first specified bracket and the depending arm of the angle bracket; a weight threaded onto the rod and located between the brackets; and nuts threaded onto the rod and engaging the opposite ends of the weight.

In testimony that I claim the foregoing as my own, I have hereto afiixed my signature in the presence of two witnesses.

BENJAMIN W. WOLF.

Witnesses ELIAS] Moon 'rz, Ronnnzr W. PEFFER'. 

